Re: Automagic tuning

On Mon, Jan 31, 2005 at 03:26:12PM -0500, Tom Lane wrote:
> Josh Berkus <josh@agliodbs.com> writes:
> >> I would like something that really measures values like random_page_cost
> >> or cpu_tuple_cost that are hardware dependent.
> >>
> >> I assume such thing does not exist?
>
> > Nope.  You gotta whip out your calculator and run some queries.
>
> Preferably a whole lot of queries.  All the measurement techniques I can
> think of are going to have a great deal of noise, so you shouldn't
> twiddle these cost settings based on just a few examples.

Are there any examples of how you can take numbers from pg_stats_* or
explain analize and turn them into configuration settings (such and
random page cost)?
--
Jim C. Nasby, Database Consultant               decibel@decibel.org
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